CN116849838A - Handle of dental drill handpiece and dental drill handpiece - Google Patents

Abstract

The invention belongs to the field of mechanical design, in particular to the field of medical equipment, and provides a handle of a dental drill handpiece and the dental drill handpiece. In order to realize the anti-suck-back function in the dental drill mobile phone, the invention provides a handle of the dental drill mobile phone, wherein a cavity serving as a waterway channel is arranged in the handle, a one-way valve body and a valve ball are sequentially arranged in the cavity, the periphery of the one-way valve body is assembled with the inner wall of the cavity in a sealing way, the interior of the one-way valve body is of a hollow structure, two ends of the one-way valve body are respectively provided with a water inlet and a water outlet, the water inlet is smaller than the water outlet, and the water inlet is used for being connected with a water pipe; the inner wall of the cavity is provided with a limiting body, and the valve ball is limited between the limiting body and the water outlet and seals the water outlet when being subjected to the action of the back suction force in the waterway. The invention provides a handle of a dental drill mobile phone, which adopts a simple one-way valve body and valve ball structure, and skillfully utilizes the effect of back suction force to realize the back suction prevention function required by the dental drill mobile phone.

Description

Handle of dental drill handpiece and dental drill handpiece

Technical Field

The invention belongs to the field of mechanical design, in particular to the field of medical equipment, and provides a handle of a dental drill handpiece and the dental drill handpiece.

Background

The dental drill handpiece is a handheld instrument, and is a common medical instrument in modern dental surgery. The main structure of the existing dental drill handpiece is shown in fig. 1, and generally comprises a handpiece 11, a drill needle 12, a handpiece cover 13, and two connected handles, such as a front handle 14 and a rear handle 15 shown in fig. 1, wherein a power wind wheel and a wind wheel shaft for driving the drill needle 12 to rotate are arranged in a space where the handpiece 11 and the handpiece cover 13 are buckled. The rear handle 15 is connected to a dental treatment instrument which provides the water source, air source, power source required for the operation of the dental bur handpiece. Corresponding channels including a waterway channel, an air pipe channel, a power connection channel and the like are arranged in the machine head 11, the front machine handle 14 and the rear machine handle 15, so that the machine head 11 is connected with water, electricity, gas and the like required by treatment. After the mobile phone treatment table is opened, water and air can reach the waterway channel and the air pipe channel of the dental drill mobile phone through the connector, the air channel blows to the power wind wheel to drive the drill needle 12 to rotate, and the waterway passes through the inside of the machine head and then is sprayed to the working area of the drill needle 12, so that the dental surgery operations such as cutting, grinding, cutting, drilling and the like are realized.

In operation, the dental drill handpiece must contact the patient's teeth, mucosal tissue, blood, saliva, etc. When the dental drill handpiece stops working, water and air can stop suddenly, but the wind wheel can continue to rotate for a period of time by virtue of inertia, at the moment, the negative pressure formed in the handpiece can suck saliva, blood, water and mucus in the oral cavity back into the dental drill handpiece, and the dental drill handpiece, the treatment table connector and the connecting pipe can be reached to the greatest extent, so that when the next patient uses the dental drill handpiece, pollutants can be sprayed into the oral cavity of the next patient along with water flow, and iatrogenic cross infection is caused. Therefore, a back suction prevention device is required to be arranged in the waterway channel of the dental drill handpiece so as to realize the back suction prevention function of the dental drill handpiece.

Disclosure of Invention

In order to realize the anti-suck-back function in a dental drill mobile phone, the invention provides a handle of the dental drill mobile phone, wherein a cavity serving as a waterway channel is arranged in the handle, the handle comprises a one-way valve body and a valve ball which are sequentially positioned in the cavity, the periphery of the one-way valve body is assembled with the inner wall of the cavity in a sealing way, the interior of the one-way valve body is of a hollow structure, two ends of the one-way valve body are respectively provided with a water inlet and a water outlet, the water inlet is smaller than the water outlet, and the water inlet is used for being connected with a water pipe;

the inner wall of the cavity is provided with a limiting body, and the valve ball is limited between the limiting body and the water outlet and seals the water outlet when being subjected to the action of the back suction force in the waterway.

In a specific embodiment, the limiting body comprises at least three bars uniformly arranged around the inner wall of the cavity, each bar is arranged along the length direction of the cavity, and the distances between adjacent bars are the same.

In another embodiment, the handle further comprises an elastic ring, and the elastic ring is located between the water outlet and the valve ball.

The valve ball is pressed against the water outlet and seals the inner ring opening when receiving the action of the back suction force in the waterway channel; or the outer ring of the elastic ring is configured to be assembled with the inner wall of the cavity in a sealing way, the inner ring opening is opposite to the water outlet, and the valve ball abuts against the elastic ring and seals the inner ring opening when being subjected to the action of the back suction force in the waterway.

In a specific embodiment, the water outlet is in a horn-shaped structure or a conical surface structure, and the valve ball forms linear closed-loop contact with the water outlet to seal the water outlet when the valve ball is abutted against the water outlet.

In a specific embodiment, the cavity comprises a first cavity and a second cavity which are communicated, the cross section of the second cavity is smaller than that of the first cavity at the communication position, the first cavity is transited to the second cavity through a step, and the step forms the limit body. Wherein, a part of the first cavity of a part of the second cavity can be overlapped at the communication position.

In a specific embodiment, to ensure the smoothness of the waterway, the handle further includes at least one water tank disposed on the inner wall of the second cavity along the length direction of the second cavity from the surface of the step.

In a specific embodiment, to enhance the reliability of the valve ball in blocking the water outlet, the handle further includes an elastic member, where the elastic member is located between the valve ball and the limiting body, and one end of the elastic member is limited on the limiting body, and the other end of the elastic member abuts against the valve ball to apply an elastic force towards the water outlet to the valve ball.

In a specific embodiment, in order to prevent the spring member from being compressed excessively to affect the smoothness of the waterway, the handle further includes a support member located at one end of the elastic member, one end of the support member is fixedly connected with one end of the elastic member, which is away from the valve ball, and the other end of the support member is towards the valve ball, and the length of the support member is greater than the limit compression length of the elastic member and less than the natural length of the elastic member.

In the above embodiment, the valve ball is a zirconia ball, the diameter of the valve ball is configured to be in a gap of between 0.15mm and 0.2mm with the inner wall of the cavity, and the length between the edge of the water outlet and the limiting body is configured to enable the activity of the valve ball in the length direction of the cavity to be in a range of between 0.3mm and 0.6 mm.

The invention also provides a dental drill handpiece comprising any one of the handles. Wherein, the handle includes back handle.

The invention provides a handle of a dental drill mobile phone, which adopts a simple one-way valve body and valve ball structure, and skillfully utilizes the effect of back suction force to realize the back suction prevention function required by the dental drill mobile phone. The water pressure of the water inlet is amplified at the water outlet through different size designs of the water inlet and the water outlet of the one-way valve body, and the working water pressure range of the dental drill handpiece is expanded. Further, by means of the combination of one or both of the elastic ring and the elastic piece, the blocking performance of the valve ball on the water outlet of the one-way valve is improved, and therefore the anti-suck-back performance is improved. The handle structure of the dental drill mobile phone provided by the invention is light and simple, convenient to assemble, safe and reliable in performance and very favorable for repeated use.

Drawings

FIG. 1 is a schematic view of the overall structure of a prior art dental drill handpiece;

FIG. 2A is an exploded view of a rear handle member according to a first embodiment of the present invention;

fig. 2B is a schematic structural diagram of a rear handle according to a first embodiment of the present invention after assembly;

FIG. 3A is a schematic view of a check valve according to an embodiment of the present invention;

FIG. 3B is a schematic view of another structure of a check valve according to an embodiment of the present invention;

FIG. 3C is a schematic view of a third structure of a check valve according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a stop bar for use with the stop body in an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a rear handle after assembly according to a second embodiment of the present invention;

FIG. 6A is an exploded view of a rear handle structural member provided in accordance with a third embodiment of the present invention;

fig. 6B is a schematic structural diagram of a rear handle after assembly according to the third embodiment of the present invention;

fig. 6C is a schematic diagram of a working state of a rear handle according to a third embodiment of the present invention;

fig. 7 is a schematic structural diagram of a rear handle after assembly according to a fourth embodiment of the present invention;

FIG. 8 is a cross-sectional view of various embodiments of the present invention where a valve ball abuts a water outlet of a check valve body;

FIG. 9A is a specific example of an elastic member used in various embodiments of the present invention;

FIG. 9B is another specific example of an elastic member used in various embodiments of the present invention;

FIG. 9C is yet another specific example of an elastic member employed in various embodiments of the present invention;

FIG. 10A is a schematic view of a structure of a water tank on a step applied in the provision of the embodiment of the present invention;

fig. 10B is a schematic structural diagram of a spring with one end limited when two cavities with different sizes are arranged in a staggered manner to form a step in the embodiment of the present invention.

Reference numerals

11. A machine head; 12. a drill needle; 13. a camera cover; 14. a front handle; 15. rear machine handle

20. A rear handle; 21. a waterway channel; 22. a water inlet pipe; 23. a one-way valve body; 2 4. A valve ball; 25. a step; 26. a seal ring; 27. an elastic ring; 28. spring

231. A water inlet; 232. water outlet

40. Gear strip

80. Linear seal ring 80

91. A slender waist lantern type elastic piece; 92. a thin waist spring; 93. a special-shaped spring; 931. stay bar

101. A first cavity; 102. a second cavity; 103. water tank

Detailed Description

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.

In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Because of the limitation of the working environment and the working mode, the whole dental drill mobile phone needs to be designed in a miniaturized manner, so that the structural miniaturization is necessarily considered when the anti-suck-back device is designed in the dental drill mobile phone, and the simple structure is an important factor for realizing miniaturization, high reliability and installation convenience. The structure is simple, and the reliability of the anti-suck-back performance is ensured, so that the anti-suck-back performance is a design difficulty. Aiming at the requirement, the invention provides a very exquisite handle structure for the dental drill mobile phone, and in a narrow space of a waterway channel of the dental drill mobile phone, the valve ball is utilized to realize the anti-suck-back function of the waterway channel, so that the dental drill mobile phone has simple structure, reliable performance and very simple and convenient installation and disassembly.

The following detailed description of specific embodiments refers to the accompanying drawings, and it should be noted that the following embodiments are described by way of example only and are not limited to application to a rear handle of a dental drill handpiece. These structures for achieving anti-suck back function may also be fitted into the front handle of the dental drill handpiece. Or when the front handle and the rear handle are combined into an integral handle, the structural component with the anti-suck-back function can be directly assembled into the handle of the dental drill handpiece. In the following embodiments, the rear handle is collectively referred to simply as a rear handle.

Example 1

Fig. 2A and 2B show exploded views of structural components of a first embodiment of a rear handle 20 of a dental drill handpiece according to the present invention, and fig. B shows an assembled structural schematic view of the embodiment. As shown in fig. 2A and 2B, a cavity structure for a waterway channel, an air channel and a power connection channel may be provided in the rear handle 20 as required, wherein the cavity structure includes a cavity as a waterway channel 21, and one end of the waterway channel 21 is connected to a water inlet pipe 22. In order to realize the anti-suck-back function of the waterway, the rear handle 20 provided by the invention is provided with the check valve 23 and the valve ball 24 in the waterway 21, the inner wall of the waterway 21 is provided with a limiting body, for example, a stop bar 40 shown in the figure, and the stop bar 40 forms a limiting step 25 towards the end surface of the valve ball 24. As shown in fig. 2B, the seal ring 26 is clamped in a clamping groove on the outer periphery of the check valve 23, and the check valve 23 and the inner wall of the waterway channel 21 are assembled in a sealing way through the seal ring 26.

The check valve body 23 is usually a metal connecting piece with supporting function, an O-shaped sealing ring 26 is sleeved on the periphery of the connecting piece, and the sealing ring 26 forms a seal with the inner wall of the waterway channel 21 after the assembly is completed and also plays a role in fixing the check valve body 23.

As shown in fig. 3A, the check valve body 23 has a water inlet 231 and a water outlet 232, and both the water inlet 231 and the water outlet 232 are cylindrical. The water inlet 231 is used to communicate with the water inlet pipe 22, and the water inlet pipe 22 is generally thin, and the diameter of the water inlet 231 is matched with the size design of the water inlet pipe 22. The cross-sectional diameter of the water outlet 232 is larger than that of the water inlet 231, which is equivalent to enlarging the contact area of the valve ball 24 and water flow, namely, the water pressure pushing the valve ball to move is increased, and the water pressure application range of the dental drill handpiece is enlarged. For this purpose, the water outlet 232 of the check valve body 23 may also be of a flare hollow design or a cone hollow design. A cross-sectional view of a flare design is shown in FIG. 3B, and a cross-sectional view of a cone design is shown in FIG. 3C.

As shown in fig. 4, which is a cross-sectional view of the position of the ribs 40, the ribs 40 whose end faces the step 25 are provided on the inner wall of the cavity, and each rib 40 forms the step 25 toward the tip end of the valve ball 24. The number of the ribs 40 is set according to the requirement and the convenience of processing, and can be generally set to 3 or 4, and the adjacent ribs are uniformly distributed around the inner wall of the cavity at the same interval. For example, fig. 4 shows a structure of 4 bars 40 uniformly distributed. Referring to fig. 2A and 2B, the ribs 40 may have a certain length in the extending direction of the cavity, and may play a role in uniform suction force, so that the suction force is uniformly distributed on the hemispherical surface of the valve ball 24 as much as possible after passing through the strip-shaped channel between the adjacent ribs, and better aligns with the water outlet 232 to push the valve ball.

According to the rear handle structure of the dental drill handpiece according to the first embodiment, when the dental therapeutic apparatus is in operation, the water inlet pipe 22 discharges water, and the water reaches the valve ball 24 through the water inlet 231 and the water outlet 232 of the check valve body 23, and the valve ball 24 is pushed to the step 25 by the running water, so that the waterway channel 21 is smooth. At the moment when the dental therapeutic apparatus stops working, water and air stop suddenly, the wind wheel continues to rotate by inertia so as to generate a back suction force in the waterway 21, the valve ball 24 is pushed to return to the position of the water outlet 232, the water outlet 232 is blocked, and pollutants are prevented from being sucked back into the water inlet pipe 22, so that the back suction prevention function of the dental drill handpiece is realized. And because the water outlet 232 of the one-way valve body 23 is larger than the water inlet 231, the water pressure range applicable to the dental drill handpiece is enlarged, and the dental drill handpiece can be normally used under low water pressure, thereby improving the performance of the dental drill handpiece.

In the embodiment of the present invention, the overall size of the dental drill handpiece is limited, and the size of each passage provided therein is smaller, and the diameter of the cavity of the waterway passage 21 in which the valve ball 24 is fitted is approximately only about 3mm for the waterway passage. To ensure the plugging effect, the invention selects the diameter of the valve ball 24 and the length between the water outlet and the limiting body according to the design experience and experimental data for many years, the sizes of the parts are designed according to the following requirements, the length between the edge of the water outlet 232 and the limiting body is configured so that the activity of the valve ball 24 along the length direction of the cavity is between 0.3mm and 0.6mm, including 0.3mm and 0.6mm, and the gap between the valve ball 24 and the inner wall of the cavity of the waterway channel 21 is kept between 0.15mm and 0.2mm, including 0.15mm and 0.2mm. The size of the water outlet 232 of the check valve body 23 is matched with the diameter of the valve ball 24 to meet the plugging requirement and prevent the valve ball 24 from being blocked in the water outlet 232. According to the above configuration data, the diameter of the valve ball 24 is approximately 2.8 mm-2.85 mm, the volume is small, the weight is light, and the movable space is limited, so that the water outlet can be rapidly plugged even under the weak back suction force. Therefore, the embodiment of the invention perfectly utilizes the back suction effect of the dental drill handpiece, and realizes the back suction prevention function by adopting a simple valve ball structure in a very narrow waterway.

Example two

As shown in fig. 5, a schematic structural diagram of an assembled rear handle of another dental drill handpiece according to an embodiment of the present invention is shown, and on the basis of the first embodiment shown in fig. 2A and 2B, an elastic ring 27 is added between the valve ball 24 and the water outlet 232 of the check valve body 23, and the size of the inner ring opening of the elastic ring 27 matches the size of the water outlet 232, and the two sizes are basically the same. Therefore, when the valve ball 24 is subjected to the action of the back suction force, the elastic ring 27 can be blocked to achieve the purpose of blocking the water outlet 232, and the elastic ring 27 is made of an elastic material, for example, the elastic ring 27 is made of fluororubber, nitrile rubber and other materials generally, so that a good sealing effect can be achieved. The outer diameter of the elastic ring 27 can be slightly larger than the inner wall of the waterway 21, and the elastic ring 27 and the waterway 21 are in interference fit to realize sealing assembly, and when the valve ball 24 is subjected to the back suction force, the valve ball abuts against the elastic ring 27 and seals the inner ring opening of the elastic ring 27. Or, the outer diameter of the elastic ring 27 can be slightly smaller than the inner wall of the waterway 21, and a gap is reserved between the elastic ring and the inner wall, so that the valve ball 24 is more convenient to install, and when the valve ball 24 is subjected to the back suction force, the elastic ring 27 is abutted to the water outlet 232 and the inner ring opening of the elastic ring 27 is blocked.

According to the rear handle structure of the dental drill handpiece provided in the second embodiment, the elastic ring 27 is arranged between the water outlet 232 and the valve ball 24, and the elastic ring 27 is in elastic contact with the valve ball 24, or the elastic ring 27 is in elastic contact with the water outlet 232 of the one-way valve body 23, so that a good sealing effect is achieved. And the valve ball 24 and the check valve body 23 do not need to be provided with very high machining precision requirements, and the installation simplicity is higher.

Example III

As shown in fig. 6A, 6B and 6C, a schematic view of a rear handle structure of a dental drill handpiece according to another embodiment of the present invention is provided, and an elastic member, such as the spring 28 shown in fig. 6A, 6B and 6C, is disposed between the valve ball 24 and the stopper on the basis of the first embodiment shown in fig. 2A and 2B. Fig. 6A is an exploded view of a rear handle structure of the dental drill handpiece, fig. 6B is a schematic view of an assembled structure, fig. 6C is a schematic view of an operating state, and an arrow between the water outlet 232 of the check valve body 23 and the valve ball 24 in fig. 6C is a water flow direction, i.e., a water pressure direction applied to the valve ball 24.

In this embodiment, the check valve body 23, the valve ball 24 and the spring 28 are positioned in sequence in the waterway 21, for example, at the end of the waterway 21 where the water inlet tube 22 is connected as shown. Referring to fig. 6C, when the dental unit starts to operate, the water inlet pipe 22 is discharged, water flows toward the valve ball 24 through the water inlet 231 of the check valve body 23, the valve ball 24 moves toward the spring 28 against the elastic force of the spring 28 under the action of water pressure, the water outlet 232 is opened, and the waterway passage 21 is opened. The water flows through the gap between the valve ball 24 and the inner wall of the cavity, the gap between the spring and the inner wall of the cavity, and the gap between the spring wires to the direction of the machine head.

Referring to fig. 6B, when the dental unit stops operating, the water inlet pipe 22 stops discharging water, the other end of the spring 28 abuts against the valve ball 24, an elastic force is applied to the valve ball 24 toward the water outlet 232 of the check valve body 23, and the valve ball 24 closes the water outlet 232 by the back suction force and the elastic force.

According to the rear handle structure of the dental drill handpiece provided in the third embodiment, on the basis of applying the pressure required for blocking the valve ball 24 by the back suction force, the elastic member further provides a larger pressure for blocking the water outlet 232 of the valve ball 24, and after the back suction force is dissipated, the valve ball 24 can be stably blocked at the water outlet 232, so that the reliability of preventing the back suction is further improved.

The person skilled in the art can configure various parameters of the spring 28 according to design experience and experimental data, specifically including that the outer diameter of the spring 28 is slightly smaller than the diameter of the valve ball 24, and the material, the wire diameter, the number of turns and the like of the spring 28 are selected according to the working water pressure range of the dental drill hand piece, so that the valve ball can be pushed to move when the rated minimum water pressure is met.

Example IV

Referring to fig. 7, a schematic view of a rear handle structure of a dental drill handpiece according to another embodiment of the present invention is provided, where, based on the above embodiments, a rear handle structure of a dental drill handpiece is provided, which includes a check valve 23, an elastic ring 27, a valve ball 24 and a spring 28, and a sealing ring 26 is clamped in a peripheral clamping groove of the check valve 23. The check valve 23, the elastic ring 27, the valve ball 24 and the spring 28 are sequentially assembled in the cavity between the water outlet of the check valve 23 and the step 25. The elastic ring 27 is located between the water outlet 232 of the check valve 23 and the valve ball 24, the valve ball 24 is located between the spring 28 and the elastic ring 27, and one end of the spring 28 is limited in the waterway channel 21 by the step 25. The radial dimension of the spring 28 and the diameter of the valve ball 24 are slightly smaller than the inner diameter of the waterway 21, and the gap formed between the spring 28 and the valve ball meets the requirement that water flow is smooth in the working state. The spring 28 and the valve ball 24 may be fixedly connected or may be independent of each other. When assembling, the sealing ring 26 is sleeved in the clamping groove at the periphery of the one-way valve body 23, and then the spring 28, the valve ball 24, the elastic ring 27 and the one-way valve body 23 are sequentially arranged in the waterway channel 21, so that the assembling and disassembling operations are very simple and convenient.

In this embodiment, the elastic contact provided by the elastic ring 27 and the elastic force provided by the spring 28 have the added effect of further enhancing the blocking performance of the valve ball 24 and greatly improving the anti-suck-back effect of the dental drill handpiece.

In any of the embodiments provided in the present invention, the valve ball 24 may be made of zirconia, and the diameter of the valve ball 24 is not equal to the diameter of the water outlet 232, so that when the diameter of the valve ball 24 is larger than the diameter of the outer edge of the water outlet 232, the outer edge of the water outlet 232 may be plugged, and the outer edge of the water outlet 232 may be chamfered in an arc shape to prevent the sharp edge from damaging the valve ball 24. In addition, when the water outlet 232 of the check valve body 23 adopts a bell mouth structure as shown in fig. 3B or a tapered structure as shown in fig. 3C, the diameter of the valve ball 24 may be configured to block the water outlet 232 at a position slightly deeper than the outer edge of the water outlet 232.

How the valve ball 24 closes the water outlet 232 is described in detail below with reference to the drawings.

As shown in fig. 8, fig. 8 is a cross-sectional view of the valve ball 24 in contact with the water outlet 232 of the check valve body 23. In this example, the valve ball 24 is abutted against the water outlet 232 at a position slightly deeper than the bell mouth structure, and it can be seen from the figure that, since the bell mouth inner wall naturally forms an annular contact surface matched with the valve ball 24, the valve ball 24 forms a closed-loop linear closed-loop contact when abutted against the annular contact surface, namely the illustrated linear sealing ring 80, the processing precision of the surface of the valve ball 24 and the surface of the bell mouth inner wall meets a certain requirement, and the linear sealing ring 80 can well seal the water outlet 232, thereby cutting off the waterway channel and preventing pollutants from flowing back to the water pipe. According to experiments, after the machining precision of the surface of the valve ball 24 and the surface of the inner wall of the bell mouth meets certain requirements, repeated operations for thousands of times still have good plugging effect.

Fig. 8 illustrates in detail a bell mouth structure as an example, and the blocking principle is the same for a water outlet of a conical surface structure. If the diameter of the valve ball is larger than that of the edge of the water outlet, a linear sealing ring can be formed at the edge of the water outlet, and in this case, the edge of the water outlet can be subjected to arc chamfering.

With the above embodiment provided by the present invention, when the elastic ring 27 is not provided, the water flow applies pressure to the valve ball 24 during the operation of the dental medical table, a certain interval is maintained between the valve ball 24 and the water outlet 232, and the waterway channel 21 is opened. When the water flow stops at the moment the dental station stops working, the water pressure is released, and the valve ball 24 is sucked back to the water outlet 232 position. Or further under the action of the elastic force exerted by the spring 28, the water-path channel 21 is blocked and pollutants are blocked by abutting against the annular contact surface of the water outlet 232 to form a linear sealing ring 80, wherein the linear sealing ring 80 is equivalent to a sealing ring and blocks water flow. If the elastic ring 27 is arranged, the valve ball 24 and the elastic ring 27 form sealing contact, and the sealing effect is good. The structure without the elastic ring 27 is simpler and the installation is simpler.

It should be noted that the spring 28 shown in the above embodiment is only an example of a common elastic member, and is not the only structure of the elastic member that can be used in the present invention. In the embodiment provided by the invention, the elastic piece can meet the following conditions according to different structures: can assemble in the cavity, have certain deformation after the assembly can compress tightly the valve ball and stop the water route. When the dental drill hand machine starts to work, the elastic body can be compressed to further deform when the valve ball is pushed by water flow, and the waterway channel is opened. When the water flow stops, the elastic body generates reset elastic force when being deformed, so that the valve ball can be quickly reset to block the water outlet. Other structures of the elastic member satisfying such a requirement are, for example, a slim waist lantern elastic member 91 shown in fig. 9A, or a slim waist spring 92 shown in fig. 9B.

In various embodiments where a resilient member is provided, such as shown in FIG. 7, when the spring is slightly compressed, water flow through the valve ball 24 and into the spring 28 from the gap between the spring wires may be very unobstructed by the waterway 21. When the water pressure is relatively high, the water flow can only be left from the gap beside the spring 28 after the spring 28 is fully compressed, and the smoothness of the waterway channel 21 is affected to a certain extent. Therefore, in order to prevent the elastic member from being compressed by the water flow transition in the working process to affect the smoothness of the waterway 21, a supporting member may be disposed at one end of the elastic member limited by the limiting body, one end of the supporting member is fixedly connected with one end of the elastic member, which is away from the valve ball, and the other end of the supporting member faces the valve ball. The length of the support member is greater than the natural length of the elastic member, but greater than the ultimate compressed length of the elastic member. Thus, when the valve ball 24 is pushed against the support member by the water flow to the position of the support member, the elastic member cannot be compressed any more. The support is for example a length of stay 931 bent inwardly into the spring at the end of the profiled spring 93 shown in figure 9C.

In the above embodiments, when the limiting body is the step 25, the step 25 may be formed by two sections of cavities with different sizes in the waterway 21. For example, as shown in fig. 10A, fig. 10A is a schematic structural diagram of the water tank 103 disposed on the step 25, as shown in the drawing, the waterway 21 includes two communicating cavities, a first cavity 101 and a second cavity 102, the cross-sectional size of the cavity of the second cavity 102 is smaller than that of the first cavity 101, and the transition portion naturally forms the step 25. Referring to fig. 4, two communicating cavities can be observed from the position of the bar, and a circle offset from the middle is the structure of the second cavity 102. Components for preventing suck-back in the various embodiments, such as the check valve body 23, the valve ball 24, the elastic ring 27, the spring 28, and the like, are all assembled in the first chamber 101. When the spring member adopts the spring 28 shown in fig. 6A, in order to avoid the influence of the spring on the smoothness of the waterway channel after being compressed, as shown in fig. 10A, at least one water tank 103 may be opened along the second cavity from the surface of the step 25, the water tank 103 is disposed on the inner wall of the second cavity 102 along the length direction of the second cavity 102 from the surface of the step 25, and the water tank 103 is communicated with the second cavity 102 to properly expand the waterway at the step 25.

As shown in fig. 10B, fig. 10B is a longitudinal cross-sectional view of the step 25 formed by the dislocation of two different cavities, and one end of the spring 28 is limited on the step 25, which is applied in the embodiment of the present invention. The two cavities are arranged in an eccentric structure in a staggered way, namely the first cavity 101 and the second cavity 102 are staggered, namely a part of the second cavity 102 and a part of the first cavity 101 are overlapped at a communicating position. The step 25 is formed at the overlapping portion, and the step 25 is not a full circle step but a crescent structure step, so that when the spring 28 is limited at the step 25, one part of one end of the spring is clamped on the step 25, and the other part is suspended. When the suspended portion of the spring 28 is not blocked by the step 25, even if the spring 28 is compressed, the suspended portion does not affect the waterway channel, so that the influence of the spring 28 on the waterway channel 21 in the compressed state is reduced. Both the first cavity 101 and the second cavity 102 may be cylindrical, the cross section of the second cavity 102 being smaller than the cross section of the first cavity 101. It should be noted that, the cavity as the waterway channel is integrally injection molded during processing the handle shell, and the structure using the dislocation arrangement of the two cavities is very convenient for processing.

The rear handle of the dental drill handpiece provided by the embodiments of the invention can be assembled with the front handle and then applied to any dental drill handpiece, and can also be integrally used as the handle of the dental drill handpiece to be applied to any dental drill handpiece. It is well known to those skilled in the art that the size of the water channel tubing in a dental drill handpiece is very small, and the size of the individual components fitted therein is still smaller, so that simple and reliable components are necessary to achieve the anti-suck back function in such small spaces. According to years of practical experience, the inventor of the invention skillfully utilizes the back suction force in the waterway, adopts a very simple valve ball structure, realizes the back suction prevention function in a narrow space in the waterway of the dental drill handpiece, and has simple structure and convenient installation. The handle structure of the dental drill handpiece with the anti-suck-back performance has very good anti-suck-back effect proved by thousands of experiments.

In the embodiments provided by the invention, the sizes of the water outlet and the water inlet are creatively designed, and compared with the water inlet, the water pressure of the water outlet is obviously increased, so that the dental drill mobile phone can work under lower working water pressure, and the experimental data surface can work normally when the water pressure is as low as about 0.03 Mpa. In addition, in the embodiments provided by the invention, which are provided with the elastic piece, the elastic piece is also designed in a targeted way for possibly influencing water flow when being compressed, so that the dental drill handpiece can work under higher water pressure. Therefore, the handle structure of the dental drill handpiece widens the range of working water pressure of the dental drill handpiece.

In each embodiment provided by the invention, the parts are simple in structure and convenient to assemble and disassemble, the repeated disinfection and use are very beneficial, and experiments prove that the stable anti-suck-back function can be maintained after hundreds of times of repeated assembly and disassembly, and the environment-friendly requirement of the medical instrument industry is very beneficial. In addition, secondary processing is completely avoided in the use process, and the consistency of the product performance is ensured, so that the use effect of the dental drill mobile phone is also ensured.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (13)

1. The handle of the dental drill mobile phone is internally provided with a cavity serving as a waterway channel, and is characterized by comprising a one-way valve body and a valve ball which are sequentially positioned in the cavity, wherein the periphery of the one-way valve body is hermetically assembled with the inner wall of the cavity, the interior of the one-way valve body is of a hollow structure, two ends of the one-way valve body are respectively provided with a water inlet and a water outlet, the water inlet is smaller than the water outlet, and the water inlet is used for being connected with a water inlet pipe;

the inner wall of the cavity is provided with a limiting body, and the valve ball is limited between the limiting body and the water outlet and seals the water outlet when being subjected to the action of the back suction force in the waterway.

2. The handle of claim 1, further comprising an elastic ring positioned between the water outlet and the valve ball.

3. The handle of claim 2, wherein the elastic ring is movably assembled in the cavity, an inner ring opening of the elastic ring is opposite to the water outlet, and the valve ball presses the elastic ring against the water outlet and seals the inner ring opening when being subjected to the action of the back suction force in the waterway; or alternatively

The outer ring of the elastic ring is configured to be assembled with the inner wall of the cavity in a sealing way, the inner ring opening is opposite to the water outlet, and the valve ball abuts against the elastic ring and seals the inner ring opening when being subjected to the action of the back suction force in the waterway.

4. The handle of claim 1, wherein the water outlet is of a horn-type structure or a conical surface structure, and the valve ball forms a linear closed loop contact with the water outlet when abutting the water outlet to block the water outlet.

5. The handle of claim 1, wherein the cavity comprises a first cavity and a second cavity in communication, the second cavity having a smaller cross-section than the first cavity, and the first cavity transitions to the second cavity through a step, the step forming the retainer.

6. The handle of claim 5, wherein a portion of the second cavity coincides with a portion of the first cavity in a communication position.

7. The handle of claim 6, further comprising at least one water trough disposed on an inner wall of the second cavity along a length of the second cavity from a surface of the step.

8. The handle of any one of claims 1-7, further comprising an elastic member positioned between the valve ball and the stopper, one end of the elastic member being stopped by the stopper, the other end abutting the valve ball to apply an elastic force to the valve ball toward the water outlet.

9. The handle of claim 8, further comprising a support member at one end of the resilient member, the support member having one end fixedly connected to an end of the resilient member facing away from the valve ball and the other end facing toward the valve ball, the support member having a length greater than the ultimate compression length of the resilient member.

10. The handle of claim 9, wherein the valve ball is a zirconia ball, the diameter of the valve ball is configured to have a clearance of between 0.15mm and 0.2mm from the inner wall of the cavity, and the length between the edge of the water outlet and the limit stop is configured to provide a play of between 0.3mm and 0.6mm along the length of the cavity.

11. The handle according to claim 1 or 2, wherein the limiting body comprises at least three bars uniformly arranged around the inner wall of the cavity, each bar being arranged along the length direction of the cavity, and the spacing between adjacent bars being the same.

12. A dental drill handpiece comprising the handle of any one of claims 1 to 11.

13. The dental drill handpiece of claim 12, wherein the handle comprises a rear handle.